Sawmill-carriage gear.



No. 685,560. Patented Oct. 29, |901.

E. S. BERRY. A

SAWMILL CARRIAGE GEAR.

(Application led Mar. 18, 1901.)

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(Application led Max'. 18, 1901.)

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(No Model.)

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LWIN S. BERRY, OF PUTNAMVILLE,

PATENT OFFICE.

VERMONT, ASSIGNOR OF ONF-HALF TORALPH W. PUTNAM, OF PUTNAMVILLE, VERMONT;

SWIVIILL-CARRIAGE G-EAR'.

sPEcIFrcArioN 'forming pmt of Letters Patent No. 685,560, dated october 29, 1901.

Application filed March 18, 1901. Serial No. 51,648. (No model.) y

To @ZZ whom t may concern:

Be it known that I, ELWIN S. BERRY, a citizen of the United States, and a resident of Putnamville,in the countyofVashington and 5 State of Vermont, have invented a new and Improved Sawmill-Carriage Gear, of which the following is full, clear, and exact description.

This invention relates to an apparatus for enabling me to move a log clear of the saw when gi gging back the carriage for a new cut. Ordinarily the carriage is drawn back in the same line in which it was advanced, and this warps the log against the saw. By means of my invention, however, when the carriage is to be gigged or returned to the startingpoint it is rst moved sidewise slightly, so as to clear the log from the saw, and then the return movement is effected.

The invention is applicable to sawlnills of all classes; but it is especially useful in connection with band-saws.

This specification is a specific description of two forms of my inventin,wh ile the claims are definitions of the actual scope thereof.

Referenceis to be had to the accompanying drawings, forming a part of this specification, in which similar'characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the invention. Fig. 2 is a sectional end elevation of the same. Fig. 3 isa plan View. Figs. 4t and 5 are detail views of a slight modification, and Fig. 6 isa perspective View of a further modification.

a indicates the carriage, which is mounted, by means of boxes a',on axles a2 in such a manner that the carriage may slide on the axles longitudinally thereof and transversely of the track. The axles a2 are provided with wheels a3, which'run on the railsc. One of these wheels is grooved and Works with a ribbed rail, so as to hold the wheels and axles in place with respect to the track.

Fastened to the carriage ot are brackets b, in which is mounted to rock a shaft b', the shaft extending longitudinally with the carriage at one side thereof. This shaft has arms b2 attached thereto, and these arms are 5o respectively connected with links b and b4,

said links extending transversely to a point over the carriage. The links b4 have their inner ends connected with forked levers b5, which are fulcrumed on brackets 01,5, attached t to the carriage. The forks of the levers b5 55 are at the lower ends of the levers, and these forks respectively engage collars as on the axles a2 of the carriage. When the shaft b is rocked, the levers b5 are thrown on their fulcrums through the action of the parts h2',- 6o b3, and b4, and this movement of the levers b5 causes the carriage to be moved on its axles in a direction laterally of the carriage.

The above-referred-to movement is imparted to the shaft b through the medium of an extension b of the link b3, which extension is. connected to a lever c, fulcrurned at its upper end to an arm c', held rigidly on the carriage by an arch-bar c2 0r other suitable support. lower or free end reaches downward below the carriage and carries a roller or wheel c3, which is adapted to run on a rail o4, arranged parallel with the rails 0.4 and extending throughout the length thereof. As the carriage moves along the track and the roller c3 yruns on the rail c4 the lever c will be held stationary with respect to the shaft b' and connected parts. Should the lever be thrown so that the roller o3 will engage the side of 8oY the rail c4 opposite that shown lengaged in Fig. 2, the parts b', b2, b3, b4, and b5 will be operated to shift the carriage on the axles, as explained. I have provided means for automatically throwing the lever to effect this purpose, and these means are best shown in- Fig. 3. According to the construction shown in that view at each end of the rail c4 are arranged a number of switch-points c5. These points are independently pivoted, their piv- 9o ots being arrangedin alinement with the rail c4. Springs (indicated at c6) are employed, one foreach switch-point c5, and these sprin gs hold the switch-points normally in the position shown in Fig. 3. Assuming now that the roller c8 in running along the track c4 in the direction of the arrow shown in Fig. 3 strikes the switch-points c5, these points will be thrown on their pivots into line with the rail c4, and thus a continuous extension of roo the rail will be formed. The instant that the roller passes one of the switchpoints its This lever c extends vertically, and its 7e spring will return it to the normal position illustrated in Fig. 3. Now when the carriage begins to return the switch-points c5, being engaged by the roller on the sides opposite the sides first engaged, will throw the roller laterally and shift it, with the lever c, to the other side of the rail c4. This will impart the necessary movement to the shaft b. The carriage will now be returned or gigged back, and when the other end of the rail cl is reached the roller c3 and the lever c will be automatically thrown back to the other side of the rail c4. This is effected by the switchpoints c5 at the rear or starting end of the rail c4, which switch-points are arranged re- Versedly to the arrangement at the other end, all of which is illustrated in Fig. 3. It will therefore be seen that as the carriage operates in the ordinary manner it will be automatically moved laterally the instant that the return movement is begun, this lateral movement being slight, but nevertheless being sufficient to clear the log of the saw. When the forward movement begins, the carriage is automatically returned to the proper longitudinal position.

Figs. 4 and 5 illustrate a modified arrangement of the switch-points. Vith this arrangement the operation is essentially the samethat is to say, the lever is thrown from one side to the other of the rail, according to the movement of the carriage-but the construction of the parts is different in that on each stationary pivot c7 are mounted two switch-points cs, such points being independently movable and being held normally in alinement with each other and diagonally with respect to the rail c4 by a spring c, which is fastened to the pivot c7 and engaged at its ends, respectively, with the switch-points. As the roller c3 moves forwardly along the track c4 it engages the switch-points and throws them int-o alinement with the rail, so as to furnish a continuous surface along which the roller travels to the full extent of the forward movement of the carriage. IVhen the return movement is begun, the roller is switched over to the other side of the rail and assumes the position indicated by dotted lines in Fig. 4. The construction shown in Figs. 4 and 5 is more advantageous than that shown in the other views, for the reason that the double switch-points, arranged as described, furnish a smooth unbroken track-surface for the roller, no matter in which direction it be moved. Reference to Fig. 3 will'show that as the roller moves along one side of the row of switch-points in striking the butts thereof a strictly continuous trackway is not provided; but in Fig. 4 no matter with which side the roller be engaged a smooth unbroken tracksurface is always provided. Fig. 6 shows an arrangement in which the switchpoints o8 are actuated by weights c1, serving the same purpose as the springs c(i and o9.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A sawmill having a laterally-shiftable carriage, and means for moving the carriage laterally upon the return movement thereof to disengaffe the work from the saw, such means comprising a rail with a switch device and a part running on the rail and switched from one side to the otherthereof.

2. A sawmill having a laterally-shiftable carriage, and means for moving the carriage laterally upon the return movement thereof, such means comprising a rail with switch devices at each end thereof, and a member running on and actuated from the rail, the switch devices serving automatically to throw said member from one side to the other of the rail.

3. A sawmill having a laterally-shiftable carriage for the purpose specified, and means for shifting the carriage, said means comprising a rail, and a member engaging the same, the rail having at one end a pivoted switchpoint serving to throw said member from one side of the rail to the other.

4. In a sawmill, the combination with a shiftable carriage and means for shifting the same, of a rail and switch devices at the end thereof, said switch devices comprising two switch-points independently mounted on a common axis, and means for uniformly holding the points in diagonal relation to the rail.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ELWIN S. BERRY. lVit-nesses:

RALPH W. PUTNAM, LEROY A. FLINT. 

